package goflags

import (
	"encoding/json"
	"fmt"
	"strconv"
	"strings"

	_ "embed"

	mapsutil "github.com/projectdiscovery/utils/maps"
	stringsutil "github.com/projectdiscovery/utils/strings"
	"golang.org/x/exp/maps"
)

var (
	//go:embed ports_data.json
	portsData string

	portOptionDefaultValues map[*Port]map[int]struct{}
	servicesMap             map[string][]int
)

func init() {
	err := json.Unmarshal([]byte(portsData), &servicesMap)
	if err != nil {
		panic(err)
	}

	portOptionDefaultValues = make(map[*Port]map[int]struct{})
}

// Port is a list of unique ports in a normalized format
type Port struct {
	kv map[int]struct{}
}

func (port Port) String() string {
	defaultBuilder := &strings.Builder{}
	defaultBuilder.WriteString("(")

	var items string
	for k := range port.kv {
		items += fmt.Sprintf("%d,", k)
	}
	defaultBuilder.WriteString(stringsutil.TrimSuffixAny(items, ",", "="))
	defaultBuilder.WriteString(")")
	return defaultBuilder.String()
}

// Set inserts a value to the port map. A number of formats are accepted.
func (port *Port) Set(value string) error {
	newKv := make(map[int]struct{})
	port.normalizePortValue(newKv, value)

	// if new values are provided, we remove default ones
	if defaultValue, ok := portOptionDefaultValues[port]; ok {
		if maps.Equal(port.kv, defaultValue) {
			port.kv = make(map[int]struct{})
		}
	}

	port.kv = mapsutil.Merge(port.kv, newKv)

	return nil
}

// AsPorts returns the ports list after normalization
func (port *Port) AsPorts() []int {
	if port.kv == nil {
		return nil
	}
	ports := make([]int, 0, len(port.kv))
	for k := range port.kv {
		ports = append(ports, k)
	}
	return ports
}

// normalizePortValues normalizes and returns a list of ports for a value.
//
// Supported values -
//
//	1,2 => ports: 1, 2
//	1-10 => ports: 1 to 10
//	1- => ports: 1 to 65535
//	-/*/full => ports: 1 to 65535
//	topxxx => ports: top most xxx common ports
//	ftp,http => ports: 21, 80
//	ftp* => ports: 20, 21, 574, 989, 990, 8021
//	U:53,T:25 => ports: 53 udp, 25 tcp
func (port *Port) normalizePortValue(portsMap map[int]struct{}, value string) {
	// Handle top-xxx/*/- cases
	switch value {
	case "full", "-", "*":
		value = portsFull
	case "top-100":
		value = portsNmapTop100
	case "top-1000":
		value = portsNmapTop1000
	}

	values := strings.Split(value, ",")
	for _, item := range values {
		if ports, ok := servicesMap[item]; ok {
			// Handle ftp,http,etc service names
			port.appendPortsToKV(portsMap, ports)
		} else if strings.Contains(item, ":") {
			// Handle colon : based name like TCP:443
			port.parsePortColonSeparated(portsMap, item)
		} else if strings.HasSuffix(item, "*") {
			// Handle wildcard service names
			port.parseWildcardService(portsMap, item)
		} else if strings.Contains(item, "-") {
			// Handle dash based separated items
			port.parsePortDashSeparated(portsMap, item)
		} else {
			// Handle normal ports
			port.parsePortNumberItem(portsMap, item)
		}
	}
}

func (port *Port) appendPortsToKV(portsMap map[int]struct{}, ports []int) {
	for _, p := range ports {
		portsMap[p] = struct{}{}
	}
}

// parseWildcardService parses wildcard based service names
func (port *Port) parseWildcardService(portsMap map[int]struct{}, item string) {
	stripped := strings.TrimSuffix(item, "*")
	for service, ports := range servicesMap {
		if strings.HasPrefix(service, stripped) {
			port.appendPortsToKV(portsMap, ports)
		}
	}
}

// parsePortDashSeparated parses dash separated ports
func (port *Port) parsePortDashSeparated(portsMap map[int]struct{}, item string) {
	parts := strings.Split(item, "-")
	// Handle x- scenarios
	if len(parts) == 2 && parts[1] == "" {
		port.parsePortPairItems(portsMap, parts[0], "65535")
	}
	// Handle x-x port pairs
	if len(parts) == 2 {
		port.parsePortPairItems(portsMap, parts[0], parts[1])
	}
}

// parsePortColonSeparated parses colon separated ports
func (port *Port) parsePortColonSeparated(portsMap map[int]struct{}, item string) {
	items := strings.Split(item, ":")
	if len(items) == 2 {
		parsed, err := strconv.Atoi(items[1])
		if err == nil && parsed > 0 {
			portsMap[parsed] = struct{}{}
		}
	}
}

// parsePortNumberItem parses a single port number
func (port *Port) parsePortNumberItem(portsMap map[int]struct{}, item string) {
	parsed, err := strconv.Atoi(item)
	if err == nil && parsed > 0 {
		portsMap[parsed] = struct{}{}
	}
}

// parsePortPairItems parses port x-x pair items
func (port *Port) parsePortPairItems(portsMap map[int]struct{}, first, second string) {
	firstParsed, err := strconv.Atoi(first)
	if err != nil {
		return
	}
	secondParsed, err := strconv.Atoi(second)
	if err != nil {
		return
	}
	for i := firstParsed; i <= secondParsed; i++ {
		portsMap[i] = struct{}{}
	}
}

const (
	portsFull        = "1-65535"
	portsNmapTop100  = "7,9,13,21-23,25-26,37,53,79-81,88,106,110-111,113,119,135,139,143-144,179,199,389,427,443-445,465,513-515,543-544,548,554,587,631,646,873,990,993,995,1025-1029,1110,1433,1720,1723,1755,1900,2000-2001,2049,2121,2717,3000,3128,3306,3389,3986,4899,5000,5009,5051,5060,5101,5190,5357,5432,5631,5666,5800,5900,6000-6001,6646,7070,8000,8008-8009,8080-8081,8443,8888,9100,9999-10000,32768,49152-49157"
	portsNmapTop1000 = "1,3-4,6-7,9,13,17,19-26,30,32-33,37,42-43,49,53,70,79-85,88-90,99-100,106,109-111,113,119,125,135,139,143-144,146,161,163,179,199,211-212,222,254-256,259,264,280,301,306,311,340,366,389,406-407,416-417,425,427,443-445,458,464-465,481,497,500,512-515,524,541,543-545,548,554-555,563,587,593,616-617,625,631,636,646,648,666-668,683,687,691,700,705,711,714,720,722,726,749,765,777,783,787,800-801,808,843,873,880,888,898,900-903,911-912,981,987,990,992-993,995,999-1002,1007,1009-1011,1021-1100,1102,1104-1108,1110-1114,1117,1119,1121-1124,1126,1130-1132,1137-1138,1141,1145,1147-1149,1151-1152,1154,1163-1166,1169,1174-1175,1183,1185-1187,1192,1198-1199,1201,1213,1216-1218,1233-1234,1236,1244,1247-1248,1259,1271-1272,1277,1287,1296,1300-1301,1309-1311,1322,1328,1334,1352,1417,1433-1434,1443,1455,1461,1494,1500-1501,1503,1521,1524,1533,1556,1580,1583,1594,1600,1641,1658,1666,1687-1688,1700,1717-1721,1723,1755,1761,1782-1783,1801,1805,1812,1839-1840,1862-1864,1875,1900,1914,1935,1947,1971-1972,1974,1984,1998-2010,2013,2020-2022,2030,2033-2035,2038,2040-2043,2045-2049,2065,2068,2099-2100,2103,2105-2107,2111,2119,2121,2126,2135,2144,2160-2161,2170,2179,2190-2191,2196,2200,2222,2251,2260,2288,2301,2323,2366,2381-2383,2393-2394,2399,2401,2492,2500,2522,2525,2557,2601-2602,2604-2605,2607-2608,2638,2701-2702,2710,2717-2718,2725,2800,2809,2811,2869,2875,2909-2910,2920,2967-2968,2998,3000-3001,3003,3005-3007,3011,3013,3017,3030-3031,3052,3071,3077,3128,3168,3211,3221,3260-3261,3268-3269,3283,3300-3301,3306,3322-3325,3333,3351,3367,3369-3372,3389-3390,3404,3476,3493,3517,3527,3546,3551,3580,3659,3689-3690,3703,3737,3766,3784,3800-3801,3809,3814,3826-3828,3851,3869,3871,3878,3880,3889,3905,3914,3918,3920,3945,3971,3986,3995,3998,4000-4006,4045,4111,4125-4126,4129,4224,4242,4279,4321,4343,4443-4446,4449,4550,4567,4662,4848,4899-4900,4998,5000-5004,5009,5030,5033,5050-5051,5054,5060-5061,5080,5087,5100-5102,5120,5190,5200,5214,5221-5222,5225-5226,5269,5280,5298,5357,5405,5414,5431-5432,5440,5500,5510,5544,5550,5555,5560,5566,5631,5633,5666,5678-5679,5718,5730,5800-5802,5810-5811,5815,5822,5825,5850,5859,5862,5877,5900-5904,5906-5907,5910-5911,5915,5922,5925,5950,5952,5959-5963,5987-5989,5998-6007,6009,6025,6059,6100-6101,6106,6112,6123,6129,6156,6346,6389,6502,6510,6543,6547,6565-6567,6580,6646,6666-6669,6689,6692,6699,6779,6788-6789,6792,6839,6881,6901,6969,7000-7002,7004,7007,7019,7025,7070,7100,7103,7106,7200-7201,7402,7435,7443,7496,7512,7625,7627,7676,7741,7777-7778,7800,7911,7920-7921,7937-7938,7999-8002,8007-8011,8021-8022,8031,8042,8045,8080-8090,8093,8099-8100,8180-8181,8192-8194,8200,8222,8254,8290-8292,8300,8333,8383,8400,8402,8443,8500,8600,8649,8651-8652,8654,8701,8800,8873,8888,8899,8994,9000-9003,9009-9011,9040,9050,9071,9080-9081,9090-9091,9099-9103,9110-9111,9200,9207,9220,9290,9415,9418,9485,9500,9502-9503,9535,9575,9593-9595,9618,9666,9876-9878,9898,9900,9917,9929,9943-9944,9968,9998-10004,10009-10010,10012,10024-10025,10082,10180,10215,10243,10566,10616-10617,10621,10626,10628-10629,10778,11110-11111,11967,12000,12174,12265,12345,13456,13722,13782-13783,14000,14238,14441-14442,15000,15002-15004,15660,15742,16000-16001,16012,16016,16018,16080,16113,16992-16993,17877,17988,18040,18101,18988,19101,19283,19315,19350,19780,19801,19842,20000,20005,20031,20221-20222,20828,21571,22939,23502,24444,24800,25734-25735,26214,27000,27352-27353,27355-27356,27715,28201,30000,30718,30951,31038,31337,32768-32785,33354,33899,34571-34573,35500,38292,40193,40911,41511,42510,44176,44442-44443,44501,45100,48080,49152-49161,49163,49165,49167,49175-49176,49400,49999-50003,50006,50300,50389,50500,50636,50800,51103,51493,52673,52822,52848,52869,54045,54328,55055-55056,55555,55600,56737-56738,57294,57797,58080,60020,60443,61532,61900,62078,63331,64623,64680,65000,65129,65389"
)